Description

2-Aminophenol-4-Sulfonic Acid is a key aromatic sulfonic acid derivative that serves as a versatile intermediate in the synthesis of complex organic molecules. Its bifunctional nature, featuring both an amine and a sulfonic acid group, makes it a critical building block for creating high-value, performance-driven compounds. This product is essential for manufacturers in the dye, pigment, and pharmaceutical industries seeking to develop products with specific colorant properties or biological activity.

Application

• Dye and Pigment Intermediate: A primary precursor in the synthesis of azo dyes, acid dyes, and other colorants for textiles, leather, and paper.
• Pharmaceutical Synthesis: Used as a key building block in the production of certain active pharmaceutical ingredients (APIs) and diagnostic agents.
• Chemical Research & Development: Employed as a versatile reagent in organic synthesis for creating novel sulfonated compounds and heterocyclic structures.
• Photographic Chemicals: Can be utilized in the formulation of certain developers and other specialty chemicals for photographic applications.
• Corrosion Inhibitor Formulation: Acts as a component in formulations designed to protect metals in industrial systems.

Basic Information

Product Name	2-Aminophenol-4-Sulfonic Acid
CAS No.	98-37-3
Molecular Formula	C6H7NO4S
Molecular Weight	189.19 g/mol
Synonyms	3-Amino-4-hydroxybenzenesulfonic acid; 4-Sulfo-2-aminophenol; 2-Amino-1-hydroxy-4-sulfobenzene; 4-Hydroxy-3-aminobenzenesulfonic acid; 2-Amino-4-hydroxybenzenesulfonic acid; 1-Amino-2-hydroxy-5-sulfonic acid benzene; Orthanilic Acid (Note: This is a common but sometimes ambiguous synonym for related compounds).
EINECS	202-658-4

Quality Control

Our 2-Aminophenol-4-Sulfonic Acid is produced under a stringent quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets precise specifications for purity, identity, and impurity profiles. We provide full traceability and a Certificate of Analysis (COA) with every shipment, confirming compliance with agreed-upon standards. Our quality commitment supports applications requiring high levels of consistency and reliability.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); keep the container tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Off-white to light brown crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.